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Technically BMW advises against replaceable bushings; I've heard mixed reviews on the PowerFlex units; some swear by them; others swear at them. As a rule I stick to OEM and OEM parts suppliers; my original CAB's (60mm) lasted 205, 000km...I expect the OEM 66mm units not to last as long (like yours).

the more I'm reading, the more I'm leaning towards going stock OE parts. Mine may not have lasted that long, I've noticed the thunking @ my feet for some time now (became particularly louder and more noticable after lowering the car), but it may have failed along time ago.....

They've finally given up completely and I'm now aware of the issue, so I went looking for it; and found it......

When u planning to install? I ended up buying the OE bushings from TMS. TMS did one thing uncharacteristic; they screwed up my order. I had ordered with them already pressed into new carriers and they only shipped the bushings. Guess I have alittle extra work tonight. Yup going in tonight. Starting around 9. Finish? Who knows.

I have Powerflex bushings too. I switched to Meyle recently and did not notice much of a difference in ride quality, however I noticed difference in steering response.
Powerflex bushing made the steering much sharper and car felt a bit lighter.
My stock ones started to fail after only 65,000 km..

BTW, I will be selling my Powerflex bushings. Pre-pressed in OEM brackets and ready to go. PM if interested.

ended up not having to change bushings. Closer inspection @ the garage showed that they are still fully intact and operational.... I had ordered OE bushings to replace, but mine are still good @ 205,000 km!!! so we left them in. On the Xi models (unlike other 3 series) you need to remove front sub-frame asembly to access the mounting holes and considering the work involved, I wasn't going to attempt if the bushings were still intact. Will likely replace in the spring regardless. Am interested in peoples experiences with the Powerflex as they look to be an excellent product!!!

ended up not having to change bushings. Closer inspection @ the garage showed that they are still fully intact and operational.... I had ordered OE bushings to replace, but mine are still good @ 205,000 km!!! so we left them in. On the Xi models (unlike other 3 series) you need to remove front sub-frame asembly to access the mounting holes and considering the work involved, I wasn't going to attempt if the bushings were still intact. Will likely replace in the spring regardless. Am interested in peoples experiences with the Powerflex as they look to be an excellent product!!!